Did you know...

• 'M's height is 23'0''. If it were compared to all other regular Pokémon in terms of height, it would be the 4th tallest Pokémon, tied with Rayquaza. 'M is more than twice Missingno.'s height.
• 'M's weight is 880.6 lbs. If it were compared to all other regular Pokémon in terms of weight, it would be the 10th heaviest Pokémon. 'M's weight is only about 25% of Missingno.'s.
• LM4 has the same height and weight as 'M.
• 'M's sprite, movepool, and stats are identical to Missingno.'s, but with two move differences: Missingno. cannot learn Pound, and 'M is incompatible with TM50 (Substitute).
• When the player captures an 'M, the battle will continue with no enemy sprite visible. Capturing "'M" again will result in capturing a level 0 or 80 Ditto; why this happens is unknown.
• If a level 0 'M is captured and sent to the PC, the game will freeze if the player tries to withdraw it. This is probably the cause of the inaccurate rumors of 'M and other glitch Pokémon being horribly dangerous to the saved game file if captured. However, if the invisible Ditto was caught and sent to the PC, it will be able to be withdrawn. Once the Ditto is in the party, it will automatically become level 1.
• If a level 0 'M is given 0 exp from a battle with another Pokémon, it levels up to 100 because of an experience underflow.
• In the party, 'M will appear as the glitched sprite of a person in the area where the player currently is.
• Before 'M is encountered, the black screen before the battle initiates is noticeably longer. This also happens with Missingno. because invalid Hall of Fame data is saved in the background, though notably not with other glitch Pokémon because they don't actually save this data. The overwritten save data is separate from where main game map/event data is saved, so a 'saved' message is only visible in Pokémon Stadium's GB Tower.
• 'M's cry is the cry of Zapdos, but it is slightly lower in pitch.